What specifically happens after you enter your username and password, then click the login button or press Enter? Does it say the username/password combination are inaccurate, or does it seem to load a new page but come right back to the login page, or does nothing happen at all?

It sounds like the username/password combo is inaccurate. In that case, did you previously provide Yahoo with an alternate email address, submit a security question and answer, connect via your cell phone, or do a combination of any of these?

The link TRA provided is a list of frequently asked or preliminary information on login issues. Many of which provide links to deeper resolutions. You replied to him saying you've tried the website he listed many times, but it didn't work out. Which specific items within the list article he provided, and which specific steps did you try?

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